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High-chlorine biomass and coal co-utilizing system with low-chlorine-corrosion and low-mercury discharge and method

A biomass and chlorine corrosion technology, applied in combustion methods, separation methods, chemical instruments and methods, etc., can solve the problems of environmental damage, uncleanness, non-renewable coal, etc., and achieve the effect of reducing Hg emission and reducing heat exchange area.

Active Publication Date: 2012-12-12
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] my country's electricity is dominated by coal-fired power generation, but coal is a non-renewable and unclean energy source. The combustion process emits a large amount of pollutants, such as trace Hg contained in coal, which will be released during the coal combustion process. Released into the atmosphere, causing damage to the environment

Method used

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  • High-chlorine biomass and coal co-utilizing system with low-chlorine-corrosion and low-mercury discharge and method
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  • High-chlorine biomass and coal co-utilizing system with low-chlorine-corrosion and low-mercury discharge and method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] EXAMPLES Tests are performed in such figure 2 The test system shown is carried out. This experiment is mainly to verify that the Cl-containing flue gas produced by the combustion of high-Cl biomass contributes to the Hg concentration in the coal-fired flue gas. 0 Oxidation and granulation of coal-fired flue gas reduce the emission of elemental Hg in various forms of Hg. In the system, the air preheater and the flue gas are not arranged in the circulating flue, but the cooler is arranged to adjust the flue gas temperature before the biomass and pulverized coal flue gas are mixed, so as to meet the conditions set by the system of the present invention. The coal sample 1 used in Example 1 and the elemental analysis and industrial analysis of the biomass are shown in Table 1. Before the experiment, the two parallel tube furnaces were heated to 1100°C by the temperature control system, and the soybean stalks were ground into a powder passing through a 200-mesh sieve. The b...

Embodiment 2

[0051] The experimental method and experimental process of Example 2 are the same as in Example 1, and the biomass components used are the same. The difference is that Example 2 selects coal sample 2. The industrial analysis and elemental analysis of coal sample 2 are shown in Table 2. The mercury content of coal sample 2 is 212ppb, the powder feeding rate is 400g / min, the excess air coefficient is 1.2, and the combustion air volume provided by the gas distribution system is 2.63m 3 / min, at 150, the Hg in the flue gas was measured by a mercury analyzer 0 22.7ng / m 3 , accounting for 73.6% of the mercury content per unit of raw coal sample 1. The biomass feed rate is 125g / min, the calorific value of biomass fuel accounts for 18.4% of the total calorific value (biomass and pulverized coal), the excess air coefficient is 1.8, and the combustion air volume provided by the gas distribution system is 1.2m 3 / min, the Hg in the mixed flue gas is measured by a mercury analyzer 0 6....

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Abstract

The invention discloses a high-chlorine biomass and coal co-utilizing system with low-chlorine-corrosion and low-mercury discharge and a method. The system comprises a coal-fired boiler system, wherein the coal-fired boiler system comprises a coal-fired boiler (1) with a boiler flue (11); the system is further provided with a biomass combustion furnace system; the combustion furnace system comprises a biomass combustion furnace (3) with a combustion furnace flue (7); an air pre-heater (4) with a cold air inlet (8), a hot air outlet and a pipeline (6) is arranged in the middle of the biomass combustion furnace flue; the smoke generated by the biomass combustion furnace flows to the air pre-heater (4) and is sent to the coal-fired boiler flue (11); a recycling flue (2) is arranged at the outer side of the biomass combustion furnace flue, wherein the inlet and the outlet of the recycling flue are arranged in the front and back sides of the air pre-heater; and the recycling flue is provided with a circulating fan (9). According to high-chlorine biomass and coal co-utilizing system with the low-chlorine-corrosion and the low-mercury discharge and the method, corrosion on high-temperature heating surface of coal powder furnace by CI (chlorine) released by biomass can be avoided; and meanwhile, the oxidation and granulation of mercury in the smoke can be accelerated by CI in the biomass, so that high temperature corrosion is avoided and the discharge of single substance of mercury is reduced.

Description

technical field [0001] The invention relates to a high-chlorine biomass and coal co-utilization system for low-chlorine corrosion and low-mercury discharge on power plant boilers. The invention also relates to a co-utilization method of high Cl biomass and coal with low Cl corrosion and low Hg emission using the system. Background technique [0002] my country's electricity is dominated by coal-fired power generation, but coal is a non-renewable and unclean energy source. The combustion process emits a large amount of pollutants, such as trace Hg contained in coal, which will be released during the coal combustion process. Into the atmosphere, causing damage to the environment. [0003] Biomass is a renewable energy source, and it is of great significance to use biomass to replace coal as much as possible. However, the Cl content of biomass is often relatively high. Direct co-combustion of biomass with high Cl content in pulverized coal boilers in thermal power plants will ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F22B31/04F23L15/00F22B31/08B01D53/64B01D53/74
CPCY02E20/34
Inventor 殷立宝高正阳徐齐胜夏瑞清曾庭华
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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